[AArch64] Add ARMv8.3 single source PAC instructions

[AArch64] Add ARMv8.3 single source PAC instructions

Add support for ARMv8.3 pointer authentication instructions
that are encoded as single source data processing instructions.

opcodes/
2016-11-08  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* aarch64-tbl.h (arch64_opcode_table): Add pacia, pacib, pacda, pacdb, autia,
	autib, autda, autdb, paciza, pacizb, pacdza, pacdzb, autiza, autizb, autdza,
	autdzb, xpaci, xpacd.
	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Regenerate.
	* aarch64-opc-2.c: Regenerate.

gas/testsuite/
2016-11-11  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* testsuite/gas/aarch64/pac.s: New.
	* testsuite/gas/aarch64/pac.d: New.